I'm Dr Chaithanya, experienced Physician attending you.
Having a history of heart disease, when there is swelling of lower limbs, the first thing to rule out is the swelling of legs due to low pumping of blood due to a weak heart. Second thing, it can be hypertension, an allergic reaction is the last thing, and considered if you have the previous history of allergy.
You should consult a doctor as soon as you can so that he can examine you and suggest a doppler test of legs if required, or he just increase the dose of your nitro patch/amlodipine or add another drug.
Any color change is an emergency and if swelling is increasing it is an emergency, otherwise, wait till morning to go to a doctor.
Keep your legs elevated to 45 degrees above ground level.
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